59° 58' 



57° 56' 



55° 54° 53° fe° ^ 51° 50° 49° 48 



47° 



46° 45° 



44° 



43° 



57° 56° 55° 54' 



Figure 15. — Ice chart, April 1963. Figures indicate day of mouth ice was 

 sighted or reported. 



